Thanks for the tip... Measured about 995 ohms at the connector, so it appears D28 is still intact.
Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ Owner - Operator Big Signal Ranch Staunton, Illinois email: b...@wjschmidt.com -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dale Boresz Sent: Sunday, July 29, 2012 6:07 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Dead K3 If you can, check the resistance across the K3 "12VDC IN" Power Pole connections (after you've disconnected your Power Supply of course). On my K3, an internal zener-like diode (D28 on the RF Board) evidently gave up its life to protect the radio from an overvoltage, and evidently the failure mode is a short circuit. This diode goes straight to ground immediately after the 6A inline fuse. I think the fuse is an auto-resetting fuse, so you can probably assume it is still completing the circuit for the purposes of your resistance measurement. If you measure a dead short, the culprit is likely D28. 73, Dale WA8SRA On 7/29/2012 6:32 PM, Dr. William J. Schmidt, II wrote: > So I was testing out my new K3 before I take it to J6 next week for a > little DXPedition work. and after about an hour of operation.. it just > quit. Dead as a door nail. has power to the back (checked) but never > so much as the display activating. Any ideas? I SURE don't want to > go back to that Flex > 3000 that I had so much trouble with on PJ4.. > > > > > > Dr. William J. Schmidt - K9HZ / J68HZ/ 8P6HK/ ZF2HZ > > > > Owner - Operator > > Big Signal Ranch > > Staunton, Illinois > > > > email: <mailto:b...@wjschmidt.com> b...@wjschmidt.com > > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ----- No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1424 / Virus Database: 2437/5163 - Release Date: 07/29/12 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
